Participants were made to undergo a weightbearing, posteroanterior, fixed-flexion radiograph of the tibiofemoral joints (TFJs).
Individuals were requested to take three tests - a six-minute walk test, a timed up-and-go test and a stair-climbing test - to assess physical function.
Magnetic resonance images of the knee were acquired using a high-resolution, 3-D, fast spin-echo sequence in order to identify the Patellofemoral joint (PFJ) cartilage and bone marrow edema-like lesions (BMELs).
The modified Whole-Organ Magnetic Resonance Imaging Score (WORMS) was used to define the severity of PFJ osteoarthritis (OA) progression when new or increased cartilage or BMELs were observed at 1 year.
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